Wrench head



FIG. 1 is a top plan view of a wrench head showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a right side elevational view thereof; and,

FIG. 4 is an enlarged perspective view taken from the bottom, front and left side, the perspective view taken from the bottom, rear and left side being identical.

The broken line showing in FIGS. 1-4 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a wrench head, as shown and described. 